vermicompost

1. By-sudha chib
msc bt 2
Punjabi university
Patiala

2. • Definition
• Vermicomposting is a simple biotechnological process of
composting, in which certain species of earthworms are
used to enhance the process of waste conversion and
produce a better product.
• Vermicomposting is a method of preparing enriched
compost with the use of earthworms. It is one of the
easiest methods to recycle agricultural wastes and to
produce quality compost.

5. Biological advantages In many soils, these play major role in converting large
pieces of organic matter into rich humus and thus
improving soil fertility
Burrowing activities The earthworm is of great value in keeping soil structure open,
creating multitude of channels that allow processes of both
aeration and drainage to occur
Earthworm castings In home garden, the presence of earthworm castings provide 5
to 11 times more nitrogen, phosphorous, and potassium as the
surrounding soil
Secretions in intestinal tracts of
earthworms
This help in making nutrients more concentrated as well as
readily available for plant uptake including micro nutrients

6. • Decomposable organic wastes such as animal
excreta, kitchen waste, farm residues and forest litter
are commonly used as composting materials.
• In general, animal dung mostly cow dung and dried
chopped crop residues are the key raw materials.
• Mixture of leguminous and non-leguminous crop
residues enriches the quality of vermicompost.

7. Species of
earthworms

8. Red earthworm is
preferred because of
its high multiplication
rate and thereby
converts the organic
matter into
vermicompost within
45-50 days.
Since it is a surface
feeder it converts
organic materials into
vermicompost from top.

9. • Characters Eisenia foetida
• Body length 3-10cm
• Body weight 0.4-0.6g
• Maturity 50-55days
• Conversion rate 2.0 q/1500worms/2 months
• Cocoon production 1 in every 3 days
• Incubation of co coon 20-23days

10. Amount of production and composting structures.
• Small-scale vermicomposting:
personal requirement (5-10 tonnes of
vermicompost annually).
• large-scale vermicomposting:
commercial scale (50 – 100 tonnes
annually)

11. • Bed method :
Composting is done on the pucca / kachcha
floor by making bed (6x2x2 feet size) of organic
mixture. This method is easy to maintain and to practice
• Pit method:
Composting is done in the cemented pits of size
5x5x3 feet. The unit is covered with thatch grass or
any other locally available materials. This method is not
preferred due to poor aeration, water logging at bottom,
and more cost of production.

14. Phas
e 1
: Processing involving collection of wastes, shredding, mechanical separation
of the metal, glass and ceramics and storage of organic wastes.
Phas
e 2
: Pre digestion of organic waste for twenty days by heaping the material along with
cattle dung slurry. This process partially digests the material and fit for earthworm
consumption. Cattle dung and biogas slurry may be used after drying. Wet dung
should not be used for vermicompost production.
Phas
e 3
: Preparation of earthworm bed. A concrete base is required to put the waste for
vermicompost preparation. Loose soil will allow the worms to go into soil and also
while watering, all the dissolvable nutrients go into the soil along with water.
Phas
e 4
: Collection of earthworm after vermicompost collection. Sieving the composted
material to separate fully composted material. The partially composted material will
be again put into vermicompost bed.
Phas
e 5
: Storing the vermicompost in proper place to maintain moisture and allow the
beneficial microorganisms to grow.

16. • Vermicomposting unit should be in a cool, moist and
shady site .
• Cow dung and chopped dried leafy materials are
mixed in the proportion of 3: 1
• kept for partial decomposition for 15 – 20 days.
• A layer of 15-20cm of chopped dried leaves/grasses
should be kept as bedding material at the bottom of
the bed.
• Beds of partially decomposed material of size 6x2x2 feet
should be made
• Each bed should contain 1.5-2.0q of raw material
and the number of beds can be increased as per raw
material availability and requirement.

17. • Red earthworm (1500-2000) should be released on the
upper layer of bed.
• Water should be sprinkled with can immediately after the
release of worms.
• Beds should be kept moist by sprinkling of water
(daily) and b y covering with gunny bags/polythene
• Bed should be turned once after 30 days for
maintaining aeration and for proper decomposition.
• Compost gets ready in 45-50 days.
• The finished product is ¾ of the raw materials used.

19. • When raw material is completely decomposed it
appears black and granular.
• Watering should be stopped as compost gets ready.
• The compost should be kept over a heap of partially
decomposed cow dung so that earthworms could
migrate to cow dung from compost.
• After two days compost can be separated and sieved for
use.

20. • The floor of the unit should be compact to prevent
earthworms’ migration into the soil.
• 15-20 days old cow dung should be used to avoid
excess heat.
• The organic wastes should be free from plastics,
chemicals, pesticides and metals etc.
• Aeration should be maintained for proper growth
and multiplication of earthworms.
• Optimum moisture level (30-40 %) should be maintained
18-25°C temperature should be maintained for proper
decomposition.

21. • Death of worms
• They are getting enough food----- food should be burried
into the bedding
• Food may be too dry---- moisture
• Food may be too wet--- bedding
• Worms may be too hot--- put bin in shade
• Bad smells
• No enough air circulation
• Dry bedding under and over the worms
• Turning of the food

22. • The level of nutrients in compost depends upon the
source of the raw material and the species of
earthworm. A fine worm cast is rich in N P K
besides other nutrients.
• Nutrients in vermicompost are in readily available
form and are released within a month of application.

23. • Parameters Content
• pH 6.8
• OC% 11.88
• OM% 20.46
• C/N ration 11.64
• Total Nitrogen (%) 1.02
• Available N (%) 0.50
• Available P (%) 0.30
• Available K (%) 0.24
• Ca (%) 0.17
• Mg (%) 0.06

24. nutrient element vermicompost garden compost
organic carbon 9.8-13.4 12.2
nitrogen 0.51-1.61 0.8
phosphorus 0.19-1.02 0.35
potassium 0.15-0.73 0.48
calcium 1.18-7.61 2.27
magnesium 0.093-0.568 0.57
sodium 0.058-0.158 0.01
zinc 0.0042-0.110 0.0012
copper 0.0026-0.0048 0.0017
iron 0.2050-1.3313 1.169
mangnese 0.0105-0.2038 0.0414

25. • Vermicompost is rich in all essential plant nutrients.
• Provides excellent effect on overall plant growth, encourages the growth of new
shoots / leaves and improves the quality and shelf life of the produce.
• Vermicompost is free flowing, easy to apply, handle and store and does not have
bad odour.
• It improves soil structure, texture, aeration, and water holding capacity and
prevents soil erosion.
• Vermicompost is rich in beneficial micro flora such as a fixers, P- solubilizers,
cellulose decomposing micro-flora etc in addition to improve soil environment.
• Vermicompost contains earthworm cocoons and increases the population and
activity of earthworm in the soil.
• It neutralizes the soil protection.
• It prevents nutrient losses and increases the use efficiency of chemical
fertilizers.
• Vermicompost is free from pathogens, toxic elements, weed seeds etc.
• Vermicompost minimizes the incidence of pest and diseases.
• It enhances the decomposition of organic matter in soil.
• It contains valuable vitamins, enzymes and hormones like auxins, gibberellins